The air intake system includes pre-filter (or cyclone, if installed), air filter, turbocharger, intercooler, intake
manifold and air pipes. A mechanical or electric sensor can be fitted to indicate the service point of the air
filter. If the engine is operating in very dusty conditions (for example spreading lime) it must be equipped
with a special pre-filter and oil bath air filter.
Turbocharger
The turbocharger is a turbo-compressor driven by exhaust gas. The compact design of the turbocharger is
fast to react even at low engine speeds. The turbocharger is lubricated and cooled by the lubrication
system of the engine. Boost pressure is controlled by a wastegate. The boost pressure is adjusted
correctly by the manufacturer, and must not be changed afterwards.
Cooling of inlet air
The compressed air from turbocharger is cooled on the air-to-air basis. The air coming from the
turbocharger has a temperature of abt. 150°C which is cooled by the cooling air of the engine. The cooling
of the compressed air stabilises the combustion, irrespective of the temperature, and minimises the
thermal and mechanical load of the engine thus lowering nitric oxides (NOx) and particles (PT).
1.3.11.1 Cooled EGR system
Fig. 17 Example construction of cooled EGR system
(1) Exhaust manifold
(2) EGR valve
(3) EGR cooler
(4) Intake manifold
1. Introduction
1-20 4th Generation Engines
8370 79492
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